Automated npm publishing — CI workflow on tag push

[yashdev9274]

Description

Set up a GitHub Actions workflow that automatically publishes supercode-cli to npm when a new version tag is pushed.

Expected Deliverables

• .github/workflows/publish.yml triggered on v*.*.* tags
• Steps: checkout → setup Bun → install → build → test → publish
• Uses NPM_TOKEN secret
• Pre-publish validation (version matches tag, dry-run)
• Document release workflow in CONTRIBUTING.md

Why

Currently publishing is manual. Automation removes human error and ensures every tag results in a published package.